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MD90 flight crew incorrectly operated vertical speed function in descent and overshoot assigned altitude.
| Attributes | |
| ACN | 505779 |
| Time | |
| Date | 200103 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : slc.vortac |
| State Reference | UT |
| Altitude | msl bound lower : 18700 msl bound upper : 19000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-90 Series (DC-9-90) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 5000 flight time type : 3000 |
| ASRS Report | 505779 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 8500 flight time type : 2000 |
| ASRS Report | 505490 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : overrode automation flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descending to FL190 in VNAV, I selected vertical speed at approximately FL200 to slow the descent rate. VNAV had already captured FL190, so selecting vertical speed canceled the FL190 in the altitude window and the airplane overshot the altitude. We descended to approximately FL187 and returned to FL190. ZLC said nothing and no conflicts were noted.
Original NASA ASRS Text
Title: MD90 FLC INCORRECTLY OPERATED VERT SPD FUNCTION IN DSCNT AND OVERSHOOT ASSIGNED ALT.
Narrative: DSNDING TO FL190 IN VNAV, I SELECTED VERT SPD AT APPROX FL200 TO SLOW THE DSCNT RATE. VNAV HAD ALREADY CAPTURED FL190, SO SELECTING VERT SPD CANCELED THE FL190 IN THE ALT WINDOW AND THE AIRPLANE OVERSHOT THE ALT. WE DSNDED TO APPROX FL187 AND RETURNED TO FL190. ZLC SAID NOTHING AND NO CONFLICTS WERE NOTED.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.